Jewel made from golden colored alloys



Patented July 8, 1941 JEWEL MADE FROM GOLDEN COLORED ALLOYS OttoLoebich, Pforzheim, Germany, assignor, by mesne assignments, to ChemicalMarketing Company Inc., New York, N. Y.

No Drawing. Application March 11, 1939, Serial No. 261,399. In GermanyMarch 25, 1938 2 Claims.

My invention relates to jewels made from goldcolored alloys, as forinstance, rings, bracelets,

necklaces, rimmings of spectacles, lorgnettes,

opera-glasses and the like, which contain gold, copper and zinc as basiccomponents and which may eventually contain also additional components,such as silver, metals of the platinum group, for instance, platinum,rhodium and palladium. I

Jewels made wholly or partly from thosealloys sometimes show thedisadvantage to be subjected to a sud-den destruction, for instance, byrecomposition. I These destructions may be disengaged also by externalinfluen'ces, as for instance, by the effect of corroding agents, such asperspiration. Hereby the co-operation of tensions which have been goneinto the object by rolling, cold-drawing or the like, effect also thedestruction which depends therefore on corrosions of tension.

Thorough investigations and experiments have shown that thosedisadvantages may be avoided by adding small amount of base metals, suchas iron, to the alloys for the manufacture of the above mentionedjewels.

The metal which prevents the corrosion of tension may be added tel quelor in the form of a pre-alloy, for instance, with zinc or with gold.

Influences, as for instance, perspiration, which are able to disengagethe dangerous tensions with alloys which do not contain iron, perhaps inthe presence of the protecting metal ironact in such a way that theyaifect only the finest particles of the protecting metal by eventually.dissolving traces of the same and thereby preventing direct attack ofthe precious metal alloy.

According to my invention the alloys for the manufacture of jewels maycontain, for instance:

Parts by weight Furthermore they may contain, for instance, 1 to 30parts of weightof silver and/or 1 to 15 parts of weight of the metals ofthe platinum group, such as palladium, platinum, rhodium, either aloneor together.

The various alloys for the jewels according to my invention may besmelted in such a way that 100 parts of the alloys contain the desiredcomponents, for instance, gold, copper, zinc and iron,

or, for instance, gold, copper, zinc, iron and silver, or, for instance,gold copper, zinc, iron and palladium, or, for instance, gold, copper,zinc, iron, silver, palladium, in such quantities that the amount of thesingle parts lies within the ranges I have the following composition:

mentioned above and that the sum of the single parts proves to be 100.If one desires to manufacture an alloy with a low grade of gold, for

instance, 33 to 35 parts of gold will be used and be manufactured bywell known methods.

An appropriate alloy for the manufacture of a jewel, for instance, aring, a bracelet, a necklace, a rimming of a spectacle and the like may1 Parts Gold 333 Copper 390 Zinc 185 Silver 82 Iron 10 Gold 33 to 60Copper 10 to Zinc 0.5 to 25 Protecting metal, such as iron or the like0.1 to 5 preferably 0.3 to 3 What I claim is: v

. '1. A jewel made of a gold-colored alloy consisting of 33.3 parts orgold, 39.0 parts of copper, 18.5 parts of zinc, 8.2 parts of silver and1.0 part of iron.

2. Gold colored jewel formedof an alloy con- 5 parts iron.

. a OTTO LOEBICH.

